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Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Millions |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 15, 2017 | Oct. 13, 2017 USD ($) $ / shares shares | Apr. 22, 2015 USD ($) $ / shares shares | Jun. 04, 2013 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) director quarter $ / shares shares | Aug. 10, 2017 USD ($) $ / shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  | 200,000,000 | 200,000,000 | 200,000,000 |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 |
Preferred stock, shares issued (in shares) |  |  |  |  | 12,000,000 | 12,000,000 | 12,000,000 |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  | 12,000,000 |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 |
Equity Distribution Agreements |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  | 12,145,144,000 | 12,145,144 |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.01
Common stock that may be sold (up to) | $ |  |  |  |  |  |  |  | $ 100.0
Share price (in dollars per share) | $ / shares |  |  |  |  | $ 6.17 | $ 6.17 |  |
Proceeds from issuance of common stock | $ |  |  |  |  | $ 73.8 |  | $ 73.8 |
Common stock reserved for issuance | $ |  |  |  |  | $ 24.7 | $ 24.7 |  |
Series B Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  | 6,000,000 | 6,000,000 | 6,000,000 |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 |
Preferred stock, shares issued (in shares) |  |  |  |  | 3,000,000 | 3,000,000 | 3,000,000 |
Preferred stock, shares outstanding (in shares) |  |  |  |  | 3,000,000 | 3,000,000 | 3,000,000 |
Shares issued (in shares) |  |  |  | 3,000,000 |  |  |  |
Preferred stock, cumulative redeemable dividend rate |  |  |  | 7.75% |  | 7.75% | 7.75% |
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares |  |  |  | $ 25 | $ 25.00 | $ 25.00 | $ 25 |
Preferred stock issuance, net | $ |  |  |  | $ 72.4 |  |  |  |
Redemption term |  |  |  |  |  | 120 days |  |
Redemption price (in dollars per share) | $ / shares |  |  |  |  | $ 25.00 | $ 25.00 |  |
Series C Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  | 4,140,000 | 4,140,000 | 4,140,000 |
Preferred stock, par value (in dollars per share) | $ / shares |  |  | $ 0.01 |  | $ 0.01 | $ 0.01 | $ 0.01 |
Preferred stock, shares issued (in shares) |  |  | 3,600,000 |  | 3,600,000 | 3,600,000 | 3,600,000 |
Preferred stock, shares outstanding (in shares) |  |  |  |  | 3,600,000 | 3,600,000 | 3,600,000 |
Preferred stock, cumulative redeemable dividend rate |  |  | 7.875% |  |  | 7.875% | 7.875% |
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares |  |  | $ 25 |  | $ 25.00 | $ 25.00 | $ 25 |
Preferred stock issuance, net | $ |  |  | $ 86.9 |  |  |  |  |
Redemption term |  |  |  |  |  | 120 days |  |
Redemption price (in dollars per share) | $ / shares |  |  |  |  | $ 25.00 | $ 25.00 |  |
Series D Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  | 5,750,000 | 5,750,000 | 5,750,000 |
Preferred stock, par value (in dollars per share) | $ / shares |  | $ 0.01 |  |  | $ 0.01 | $ 0.01 | $ 0.01 |
Preferred stock, shares issued (in shares) |  | 5,400,000 |  |  | 5,400,000 | 5,400,000 | 5,400,000 |
Preferred stock, shares outstanding (in shares) |  |  |  |  | 5,400,000 | 5,400,000 | 5,400,000 |
Preferred stock, cumulative redeemable dividend rate | 5.695% | 8.00% |  |  |  | 8.00% | 8.00% |
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares |  | $ 25 |  |  | $ 25 | $ 25 | $ 25 |
Preferred stock issuance, net | $ |  | $ 130.5 |  |  |  |  |  |
Redemption term |  |  |  |  |  | 120 days |  |
Redemption price (in dollars per share) | $ / shares |  |  |  |  | $ 25.00 | $ 25.00 |  |
Series B, Series C and Series D Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of quarters with no dividends that results in voting rights | quarter |  |  |  |  |  |  | 6 |
Number of elected directors pending preferred stock voting rights | director |  |  |  |  |  |  | 2 |
Stockholders required for term changes, percentage |  |  |  |  | 66.67% | 66.67% |  |

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